Boat users are advised that passage through the lock must be booked in advance. Further information is available on the City of York Council website (see 'External Links' below).
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Castle Mills Lock
Castle Mills Lock (York) is 34 metres long x 6 metres wide. It was built in 1796, widened in 1889 and is now the only operational lock on the Foss Navigation.
Working in conjunction with the adjacent bypass sluice, Castle Mills Lock maintains the River Foss at 2.6m above the normal summer level of the River Ouse.
The lock gates are opened and closed by a system of winches, cables and chains, but they are now rarely used. (Commercial traffic on the Navigation ceased in 1997 and there is little to attract leisure traffic to the short (2.8km) section of navigable waterway that lies beyond the lock.)
A vertical slot in the centre of each sidewall allows 'stop planks' to be inserted, facilitating the drainage and maintenance of the chamber, gates, paddles, and associated equipment.